Re: Using DD to write to a specific LBA (converting LBA to offset, blocksize, count)

[Phillip Susi]

Hard drive sectors are 512 bytes so use a bs of 512 and skip FF68 
blocks.  I'm not sure if dd will accept hex numbers, try prefixing it 
with a 0x ( the C convention for hex numbers ).  Otherwise, convert the 
hex number to decimal.

Mark Perino wrote:
> How does one convert from LBA to skip, blocksize, and count?
>
> IE I want to write zero's over LBA 00FF68 through 00FF6F on a raw device
> /dev/sda /dev/rhdisk4, /drv/C0T0D0S1, etc..
>
> As an example under AIX I would like to use:
>
> dd if=/dev/zero of=/dev/rhdisk4 skip=AAAA blocksize=BBBB count=CCCC
>
> Where can I obtain the info to calculate AAAA, BBBB and CCCC?  Whatever
> platform you can show me how to do the math on I can probably figure out
> how to do this on AIX, Linux, Solaris, etc..
>
> _______________________________________________
> Bug-coreutils mailing list
> address@hidden
> http://lists.gnu.org/mailman/listinfo/bug-coreutils